130 PROCEEDINGS OF THE NATIONAL MUSEUM. vou 63. 



Male. — Length 1.10 mm. Similar in most respects to the female. 

 Antennae 0.77 mm. long; abdomen rather broadly elliptical, as long 

 as but narrower than, the thorax, two-thirds as wide as long, 0.422 

 mm. long. 



Type locality. — Washington, District of Columbia. 



Type.— Csit. No. 25461, U.S.N.M. Type, allotype, and four 

 paratypes. 



Described from 25 females and 7 males collected by the author, 

 April 28 and 29, 1921, on the leaves of Tilia americana Linnaeus. 



Nine specimens are mounted on card points, the rest are in alcohol 

 and are retained in my collection. 



18. LEPTACIS AURIPES (Ashmead). 



Polymecus miripes Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 283. — Brdes, 

 Connecticut State Geol. Nat. Hist. Surv., Bull. No. 22, 1916 (1917j, p. 535. 



Female. — Length 1 mm. Head wider than the thorax, less than 

 twice as wide as long, entirely distinctly shagreened, more strongly 

 so above, in the region of the vertex and occiput; vertex rounded 

 behind; notauli briefly indicated anteriorly; mesonotum with a short 

 median projection posteriorly; scutellum pubescent, foveated at base, 

 with a short straight spine above; abdomen a little longer than the 

 head and thorax united, gradually contracted into a tail from the apex 

 of the second segment; thhd segment one-half the length of 'the 

 fourth; fifth twice as long as wide, and as long or a little longer than 

 third and fourth segments united. Mahogany-colored; antennae and 

 legs bright golden yellow; head black. 



Type locality. — Virginia. 



Type.— Cat. No. 25462, U.S.N.M. 



Redescribed from the type specimen. The antennae (except one 

 scape) and several of the legs, are lost. 



19. LEPTACIS INCERTA (Ashmead). 



Plate 1, fig. 14. 



Anopedias incertus Ashmead, Can. Ent., vol. 19, 1887, p. 130. — Cresson, Syn. 

 Hym., 1888, p. 249.— Ashmead, Bull. 45, U. S. Nat. Mus., 1893, p. 292. 



Female. — Length 1 .3 mm. Head wider than the thorax, a little over 

 twice as wide as long; frons subopaque, finely and beautifully sha- 

 greened, with a few punctures at upper angles; vertex, occiput, and 

 cheeks also finely shagreened ; vertex separated medially from the oc- 

 ciput by a low carina; antennae finel}^ pubescent, about as long as 

 the head and the thorax united; the relative lengths and widths of 

 joints are shown adequately in the accompanying illustration ; thorax 

 a trifle higher than wide, slightly more than two-thirds as wide as 

 long, finely shagreened above and on the sides of the pronotum; 

 notauli absent; mesonotum with a very short median projection be- 



